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If Songhua rises south of Heaven Lake, it would have to "cross" the Yalu or the Tumen to flow north. One river crossing another river is impossible, I think...-- Jack Upland ( talk) 01:58, 3 March 2021 (UTC)
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If Songhua rises south of Heaven Lake, it would have to "cross" the Yalu or the Tumen to flow north. One river crossing another river is impossible, I think...-- Jack Upland ( talk) 01:58, 3 March 2021 (UTC)